1. [v]  affect with an ulcer; "Her stomach was ulcerated"
2. [v]  undergo ulceration; "Her stomach ulcerated"

ULCERATE is a 8 letter word that starts with U.

1. \Ul"cer*ate\, v. i. [imp. & p. p. {Ulcerated}; p. pr. &
   vb. n. {Ulcerating}.] [L. ulceratus, p. p. of ulcerare, fr.
   ulcus ulcer.]
   To be formed into an ulcer; to become ulcerous.
   
   

2. \Ul"cer*ate\, v. t.
   To affect with, or as with, an ulcer or ulcers. --Harvey.